FR2361705A1 - Fire alarm with sensor coupled on loop - has additional sensors coupled on parallel loop scanned periodically for transmission to monitoring station (NL 13.2.78) - Google Patents
Fire alarm with sensor coupled on loop - has additional sensors coupled on parallel loop scanned periodically for transmission to monitoring station (NL 13.2.78)Info
- Publication number
- FR2361705A1 FR2361705A1 FR7724308A FR7724308A FR2361705A1 FR 2361705 A1 FR2361705 A1 FR 2361705A1 FR 7724308 A FR7724308 A FR 7724308A FR 7724308 A FR7724308 A FR 7724308A FR 2361705 A1 FR2361705 A1 FR 2361705A1
- Authority
- FR
- France
- Prior art keywords
- loop
- coupled
- monitoring station
- fire alarm
- transmission
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Withdrawn
Links
Classifications
-
- G—PHYSICS
- G08—SIGNALLING
- G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
- G08B26/00—Alarm systems in which substations are interrogated in succession by a central station
- G08B26/005—Alarm systems in which substations are interrogated in succession by a central station with substations connected in series, e.g. cascade
Landscapes
- Business, Economics & Management (AREA)
- Emergency Management (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Alarm Systems (AREA)
- Fire Alarms (AREA)
Abstract
A number of fire alarm units are coupled in parallel on a loop connected to a central monitoring station. A switching stage ensures that the alarm circuits are scanned sequentially and are coupled to the monitoring stage one at a time. The alarm loop is coupled to a monitoring stage which has receiver windings that generate signals to an output winding. A resonator circuit with limiting diodes and a threshold trigger is coupled to a micro computer. Each alarm loop has a sensor and an associated timing stage that is activated to close a switch to a predetermined time base to establish a connection with the monitoring station.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE19762635763 DE2635763A1 (en) | 1976-08-09 | 1976-08-09 | FIRE ALARM SYSTEM WITH SEVERAL DETECTORS THAT CAN BE OPERATED IN ONE MESSAGE LOOP |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| FR2361705A1 true FR2361705A1 (en) | 1978-03-10 |
Family
ID=5985047
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| FR7724308A Withdrawn FR2361705A1 (en) | 1976-08-09 | 1977-08-05 | Fire alarm with sensor coupled on loop - has additional sensors coupled on parallel loop scanned periodically for transmission to monitoring station (NL 13.2.78) |
Country Status (6)
| Country | Link |
|---|---|
| JP (1) | JPS5320798A (en) |
| DE (1) | DE2635763A1 (en) |
| FR (1) | FR2361705A1 (en) |
| IT (1) | IT1085725B (en) |
| NL (1) | NL7708750A (en) |
| SE (1) | SE7708964L (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE2836760C2 (en) * | 1978-08-23 | 1983-11-17 | Dr. Alfred Ristow GmbH & Co, 7500 Karlsruhe | Electronic remote monitoring system |
| JPS58127292A (en) * | 1982-01-26 | 1983-07-29 | ニツタン株式会社 | Fire sensing system |
| US4616138A (en) * | 1983-11-29 | 1986-10-07 | Hochiki Corporation | Analog-type fire detector |
| DE19631302B4 (en) * | 1996-08-02 | 2006-12-14 | Leuze Electronic Gmbh & Co Kg | Sensor actuator bus system |
-
1976
- 1976-08-09 DE DE19762635763 patent/DE2635763A1/en active Pending
-
1977
- 1977-08-05 FR FR7724308A patent/FR2361705A1/en not_active Withdrawn
- 1977-08-05 IT IT26502/77A patent/IT1085725B/en active
- 1977-08-08 SE SE7708964A patent/SE7708964L/en unknown
- 1977-08-08 JP JP9490077A patent/JPS5320798A/en active Pending
- 1977-08-08 NL NL7708750A patent/NL7708750A/en not_active Application Discontinuation
Also Published As
| Publication number | Publication date |
|---|---|
| IT1085725B (en) | 1985-05-28 |
| NL7708750A (en) | 1978-02-13 |
| SE7708964L (en) | 1978-02-10 |
| JPS5320798A (en) | 1978-02-25 |
| DE2635763A1 (en) | 1978-02-16 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| ST | Notification of lapse |